A NATO spokesman says NATO forces in Bosnia have raided the homes of the son and daughter of Radovan Karadzic, the fugitive Bosnian Serb war crimes suspect.

The NATO official, Derek Chappel, says the alliance believes Sasa and Sonja Karadzic are part of a support network that has allowed their father to remain in hiding for more than 11 years.

NATO troops broke into their apartment buildings before dawn this Tuesday morning in the Bosnian town of Pale, east of the capital, Sarajevo.

The alliance spokesman says the troops planned to interview the son and daughter and search for clues on the whereabouts of Radovan Karadzic.

The former Bosnian Serb leader was charged with genocide in 1995 by a U.N. war crimes tribunal in The Hague for his alleged role in atrocities committed by Serbian troops during Bosnia's (1992-95) civil war.

Karadzic's wartime military chief, Ratko Mladic, also was charged with genocide and remains at large.